[PATCH 1/2] gas: Add CodeView constant for aarch64

[Mark Harmstone]

Hi Jan,

 > I'd be happy to approve this, but I'd really like to know where this number
 > is coming from.

Have a look at the top of gas/codeview.h, which includes the URL of the GitHub
repository this comes from.

 > (I find it particularly interesting
 > that the wikipedia page on CodeView says "Operating system  MS-DOS",
 > calling out 386 mode and monochrome monitor support as something noteworthy.
 > Nevertheless at the bottom there is "This page was last edited on
 > 25 December 2022, at 04:29 (UTC).")

Yes, CodeView the program is long dead, but its format lives on in the PDBs
generated by MSVC.

Mark